The only bad thing is that everything sticks to it. Dog hair, fuzz everything. That's the only downfall. Its definetly the easiest to work with.

I like working with wool because of the felted join.
My wools socks are embedded with dog hair and wood shavings, and not being able to run them through the washer/dryer means it has to be picked off by hand.

My acrylic blankets are really embedded with dog hair but the washer/dryer does a good job at removing it.

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Petroleum based knitter, removing that nasty oil from the ground one skein at a time.